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LTCU discriminates the 18 inputs comparing them with a remote controlled threshold (one for each input). It can mask the noisy inputs It gives as output two Trigger proposals (T 0 and T 1 ), each one coming from FastOR of 9 inputs. It measures the rate of Trigger proposals for each input. All the board functionalities are driven by a remote controller through RS232 LTCU 9 T1T1 T2T2 9 TCU  32 from v791 1 board for each of 20 Racks per chamber (80 in total) where the induction II and collection planes are cabled in It receives as input analogical  32 coming from the v791 boards (generally 9 of 2nd induction and 9 of collection) LTCU Prototype overview CH_out

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Status of FPGA logic design RS232 interface logic are implemented and simulated Test pulse and DAC logics are under test on board Input interface and FastOR are implemented Mask block and fired channel recorder must be designed

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LTCU – Control word decoder Receives 1 byte data Decodes the control word received Give a different signal for each control word

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LTCU – Control word decoder: schematic

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LTCU – Operation controller FSM designed in ONE HOT logic; Receives signal from Control word controller; Gives different enable signal for each controller of RS232 interface; Give test pulse and time window signals.

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LTCU – Control Software LTCU prototype is controlled via RS232 by LTCU Control software developed in NI Labview; The LTCU Control drives all the boad functionalities; Software is partially developed: ready up to now DAC threshold controller and Test pulse controller

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Only enabled channels are sent to LTCUThe transmission start when send button is pressed LTCU – Slow Control software: DAC threshold controller Each channel threshold can be set All channels can be set together

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Conclusions The LTCU prototype board are printed The electric test of board is in progress The LTCU RS232 interface and its all functionalities are designed and simulated The LTCU control software is partially developed